Importance

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Abstract

An automatic pager responds to a caller to input the caller's identification code and transmit a received identification code to an absent subscriber possessing the pager. The device includes: a sensor for ringing signals on public telephone lines; an audio frequency detector for dial tones, busy tones, click tones and acceptance signals from public telephone lines: a DTMF generator responds to a stored subscription number signal and transmits it via public telephone lines; a DTMF receiver responds to a DTMF signal from public telephone lines to generate the called subscription number; an audio synthesizer generates a message indicating the subscriber's absence, which message requests the caller's identification code and is transmitted through public telephone lines; a hybrid circuit matches public telephone lines with the DTMF generator, DTMF receiver, audio frequency sensor, and audio synthesizer; a relay selectively connects public telephone lines with the ringing signal sensor and hybrid circuit; a keyboard derives the subscriber's pager subscription number, the caller's ID code, subscription number and serial number; a CPU: (1) inputs the subscriber's subscription number, (2) responds to a caller during the subscriber's absence by sending a message indicating the subscriber's absence and requesting the caller to input his ID or telephone number, (3) re-forms a communicating loop when the caller's ID or telephone number is received. (4) transmits the subscriber's pager subscription number and received caller's ID or telephone number and serial number to apprise the subscriber of a call during his absence.

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First Claim